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DEVELOPER BENCH
Inspect the Base64URL-encoded header and payload of a token locally. Decoding does not verify the signature, claims, issuer, expiry, or authenticity.
WHAT THIS DOES
Runs entirely in your browser.
/tools/jwt-decoderjwt-decoderv2.0.0LOCAL · LOCAL RUNIMPLEMENTED — This workbench is functional in the current release.BATCH / ONE VALUE PER LINE
Up to 200 lines, one at a time, in this browser. Each line takes the place of token and everything else stays as you set it. Nothing is uploaded, and the row limit is not exceeded silently.
METHOD / LOCAL RUN
The first two dot-separated JWT segments are Base64URL decoded and parsed as JSON. No signature verification, key lookup, or network request occurs.
Boundary: Decoded content is not proof that a token is authentic or safe to trust.
The calculation or transformation runs in your browser using the values entered above. No input is sent to UtilityForge for this tool.
EXAMPLES / LOCAL RUN FIXTURES
FAQ
No. It only decodes the readable header and payload. Signature and claim validation require issuer keys and application rules.
No. This published tool runs locally in your browser. UtilityForge does not send the values entered in this workbench to a server.
The workbench states the exact method behind every result — the formula or procedure this page runs — so you can verify the computation instead of trusting a black box.
No. This workbench runs in the page: JWT are read by the code your browser already downloaded, and UtilityForge receives neither the values nor the result.
Yes, and it is enforced rather than advertised: JWT (100,000 characters). The limit is a browser input limit on a tool that runs on this device, so nothing is truncated after being sent anywhere.
Decoded content is not proof that a token is authentic or safe to trust.
RELATED TOOLS
LOCAL — Runs entirely in your browser.
COMMON USE CASES / SOURCE NOTE
Last reviewed:
Source information: Browser Base64URL decoding and JSON parsing; no issuer, key, signature, or external verification service is consulted.